EP2181853B1 - Thermosensitive recording medium - Google Patents

Thermosensitive recording medium Download PDF

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Publication number
EP2181853B1
EP2181853B1 EP08827733.0A EP08827733A EP2181853B1 EP 2181853 B1 EP2181853 B1 EP 2181853B1 EP 08827733 A EP08827733 A EP 08827733A EP 2181853 B1 EP2181853 B1 EP 2181853B1
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EP
European Patent Office
Prior art keywords
recording medium
solution
thermosensitive recording
parts
carbon atoms
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Application number
EP08827733.0A
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German (de)
English (en)
French (fr)
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EP2181853A1 (en
EP2181853A4 (en
Inventor
Tatsuyuki Kurihara
Tatsuo Nagai
Yoshimi Midorikawa
Akihito Ogino
Mamoru Suga
Yoshimune Aosaki
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nippon Paper Industries Co Ltd
Mitsubishi Chemical Corp
Original Assignee
Nippon Paper Industries Co Ltd
Mitsubishi Chemical Corp
Jujo Paper Co Ltd
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Publication of EP2181853A1 publication Critical patent/EP2181853A1/en
Publication of EP2181853A4 publication Critical patent/EP2181853A4/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
    • B41M5/26—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used
    • B41M5/30—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used using chemical colour formers
    • B41M5/333—Colour developing components therefor, e.g. acidic compounds
    • B41M5/3333—Non-macromolecular compounds
    • B41M5/3335—Compounds containing phenolic or carboxylic acid groups or metal salts thereof
    • B41M5/3336—Sulfur compounds, e.g. sulfones, sulfides, sulfonamides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
    • B41M5/26—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used
    • B41M5/30—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used using chemical colour formers
    • B41M5/333—Colour developing components therefor, e.g. acidic compounds
    • B41M5/3333—Non-macromolecular compounds
    • B41M5/3335—Compounds containing phenolic or carboxylic acid groups or metal salts thereof
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M2205/00—Printing methods or features related to printing methods; Location or type of the layers
    • B41M2205/04—Direct thermal recording [DTR]
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M2205/00—Printing methods or features related to printing methods; Location or type of the layers
    • B41M2205/38—Intermediate layers; Layers between substrate and imaging layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M2205/00—Printing methods or features related to printing methods; Location or type of the layers
    • B41M2205/40—Cover layers; Layers separated from substrate by imaging layer; Protective layers; Layers applied before imaging
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
    • B41M5/26—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used
    • B41M5/40—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used characterised by the base backcoat, intermediate, or covering layers, e.g. for thermal transfer dye-donor or dye-receiver sheets; Heat, radiation filtering or absorbing means or layers; combined with other image registration layers or compositions; Special originals for reproduction by thermography
    • B41M5/42—Intermediate, backcoat, or covering layers
    • B41M5/426—Intermediate, backcoat, or covering layers characterised by inorganic compounds, e.g. metals, metal salts, metal complexes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
    • B41M5/26—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used
    • B41M5/40—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used characterised by the base backcoat, intermediate, or covering layers, e.g. for thermal transfer dye-donor or dye-receiver sheets; Heat, radiation filtering or absorbing means or layers; combined with other image registration layers or compositions; Special originals for reproduction by thermography
    • B41M5/42—Intermediate, backcoat, or covering layers
    • B41M5/44—Intermediate, backcoat, or covering layers characterised by the macromolecular compounds

Definitions

  • the present invention relates to a thermosensitive recording medium that utilizes a color formation reaction between an electron donating leuco dye and an electron accepting color developing agent and more particularly to a thermosensitive recording medium having excellent color developing sensitivity, moist heat resistance and plasticizer resistance.
  • thermosensitive recording medium containing a thermosensitive color developing layer, the major component of which is an electron accepting color developing agent (henceforth referred to as "color developing agent”) that develops color when heated with a colorless or pale colored electron donating leuco dye (henceforth referred to as “dye”), is widely used.
  • color developing agent an electron accepting color developing agent
  • thermal printer and the like in which a thermal head is contained is used to record on the thermosensitive recording medium.
  • This recording method has many feature such as low maintenance, low-cost, compact size, clear color development, etc. as compared with other recording methods. Therefore, it is used extensively in facsimile machines, computer printers, automatic ticket vending machines, measurement recorders, handy outdoor terminals and the like.
  • the thermosensitive recording medium is used not only as the output paper in the various devices mentioned above but is also becoming popular for use in applications such as vouchers and the like where excellent durability is required.
  • thermosensitive recording medium When a thermosensitive recording medium is used for various tickets, receipts, labels, bank ATM print outs, gas and electrical meter read outs and vouchers such as horse racing tickets and the like, the medium needs to have plasticizer resistance and oil resistance, to avoid the problem of printed letter readability when the medium is stored for an extended period of time in contact with a film or synthetic leather, and light resistance and heat resistance to prevent fading when the medium is exposed to sunlight for an extended period of time.
  • thermosensitive recording medium prepared by using a diphenyl sulfone derivative as the color developing agent (References 1, 2 and 9), a thermosensitive recording medium prepared with a phenolic condensation compound (Reference 3), a thermosensitive recording medium prepared with a phenolic compound (Reference 4) and also a thermosensitive recording medium in which other color developing agents are combined with these agents (References 5-8) and the like have been disclosed.
  • Thermosensitive recording media have been more frequently used in applications such as vouchers and the like recently, and additional image durability, particularly improved quality that allows bar codes to be read over time, is needed.
  • the prior art described above provides adequate bar code readability immediately after printing when a specific color developing agent and a stabilizer are used in combination, a specific stabilizer and a sensitizer are used in combination, a specific color developing agent is used and the like.
  • the bar code readability becomes inadequate over time, and problems are encountered with color developing sensitivity, moist heat resistance, plasticizer resistance and the like.
  • the objective of the present invention is to present a thermosensitive recording medium with excellent color developing sensitivity, moist heat resistance and plasticizer resistance that also provides an image section with excellent heat resistance, background coloring, light resistance and the like.
  • the diphenyl sulfone derivatives previously utilized as a color developing agent or an image stabilizer in a thermosensitive color developing layer of a thermosensitive recording medium were mainly the derivatives containing hydroxyl groups in both ends. (See References 2-4 etc.) Then the inventors developed a thermosensitive recording medium using a diphenyl sulfone derivative by leaving one of the hydroxyl groups and replacing the other hydroxyl group with an alkoxy group in the diphenyl sulfone derivative (Reference 1). The developed diphenyl sulfone derivative has a higher melting point than the derivative with two hydroxyl groups at both ends and, as a result, the heat resistance of the thermosensitive recording medium using the diphenyl sulfone derivative was also high.
  • thermosensitive recording medium with well balanced performance among color developing sensitivity in the image section, moist heat resistance, plasticizer resistance and the like could be obtained through the combined use of a diphenyl sulfone derivative (Reference 1) in which one end contains a hydroxyl group and the other end contains an alkoxy group and a phenol derivative with a specific structure.
  • Reference 1 diphenyl sulfone derivative
  • the present invention is :
  • the present invention is:
  • thermosensitive recording medium of the present invention has a well balanced performance among color developing sensitivity in the image section, moist heat resistance, plasticizer resistance and the like.
  • the co-presence of a phenol derivative represented by chemical formula 1 and a diphenyl sulfone derivative represented by chemical formula 2 in the thermosensitive color developing layer is presumed to support the well balanced performance by increasing the stability of the electron transfer complex that is the reaction product of a color developing agent and a basic dye.
  • thermosensitive recording medium of the present invention is prepared by forming a thermosensitive color developing layer on a substrate.
  • thermosensitive color developing layer contains phenol derivative(s) represented by chemical formula 1 and a diphenyl sulfone derivative represented by chemical formula 2 as the color developing agents.
  • the phenol derivative of the present invention is represented by the chemical formula 1 shown below.
  • the phenol derivative of the present invention preferably contains one hydroxyl group or an alkoxy group and zero or one hydroxyl group with two hydrogen atoms in the ortho positions on each of the benzene rings that constitute the phenol derivative, and preferably contains zero or one substituent (R 2 -R 4 ) on each of the benzene rings.
  • the hydroxyl group and the alkoxy group are located in para or ortho position to X.
  • the substituents (R 2 -R 4 ) are preferably located in ortho position to them.
  • the substituents (R 2 -R 4 ) are preferably located in para position to them.
  • OR 1 is positioned in positions 2 or 4 in the A ring. When OR 1 is located in position 2, R 4 is positioned in 5, and when OR 1 is positioned in 4, R 4 is positioned in position 3. In the B ring, OH is located in either position 2' or 4'. When OH is located at position 2', R 2 is located in position 5', and when OH is positioned in position 4', R 2 is located in position 3'. In the C ring, OH is located in position 2" and R 3 is located in position 5".
  • the particularly preferred phenol derivatives is (1) the condensation products represented by chemical formula 1 wherein R 1 is a hydrogen atom, which is, for example, 1) of chemical formula 4, and (2) the compound wherein p is 0, which is, for example, 2) to 6) of chemical formula 4.
  • thermosensitive recording medium derived may not have sufficient color developing sensitivity.
  • the specific examples of the two ring condensation product of the phenol derivatives (1) may include, for example, 2,2'-methylene bisphenol, 2,2'-methylene bis(4-chlorophenol), 2,2'-methylene bis(5-chlorophenol), 2,2'-methylene bis(4-hydroxyphenol), 2,2'-methylene bis(5-hydroxyphenol), 2,2'-methylene bis(4-methylphenol), 2,2'-methylene bis(5-methylphenol), 2,2'-methylene bis(4-ethylphenol), 2,2'-methylene bis(5-ethylphenol), 2,2'-methylene bis(4-n-propylphenol), 2,2'-methylene bis(4-isopropylphenol), 2,2'-methylene bis(5-n-propylphenol), 2,2'-methylene bis(5-isopropylphenol), 2,2'-methylene bis(4-n-butylphenol), 2,2'-methylene bis((4-n-butylphenol), 2,2'-m
  • the preferred condensation products may include 2,2'-methylene bis(4-methylphenol), 2,2'-methylene bis(4-ethylphenol), 2,2'-methylene bis(4-isopropylphenol), 2,2'-methylene bis(4-t-butylphenol), 2,2'-methylene bis(4-n-propylphenol), 2,2'-methylene bis(4-n-butylphenol), 2,2'-methylene bis(4-t-amylphenol), 2,2'-methylene bis(4-cumylphenol), 2,2'-ethylidene bis(4-methylphenol), 2,2'-ethylidene bis(4-ethylphenol), 2,2'-ethylidene bis(4-isopropylphenol), 2,2'-ethylidene bis(4-t-butylphenol), 2,2'-ethylidene bis(4-n-butylphenol), 2,2'-ethylidene bis(4-(4-eth
  • the phenol derivatives of (1) are preferably two ring condensation products or mixed condensation products containing mainly two ring condensation products and also containing at least one condensation product containing at least three rings, preferably containing three rings to five rings.
  • the content of the two ring condensation product is preferably from 40% to 99%, more preferably from 45% to 98%, even more preferably from 46% to 90%, particularly preferably from 48% to 85% and exceptionally preferably from 50% to 80%. That is, the desired improvements in the sensitivity of thermosensitive recording medium and storage stability of the color developed image and the background are not realized sufficiently when the content of the two ring condensation product is less than 40% or greater than 99%.
  • the term "%" signifies the "area %" in the high performance liquid chromatography analytical results.
  • the phrase "at least one of three ring to five ring condensation products” signifies either (a) three ring condensation products, (b) a mixture of three ring condensation products and four ring condensation products, or (c) a mixture of three ring condensation products, four ring condensation products and five ring condensation products.
  • the phrase "contains mainly two ring condensation products” signifies that the proportion of two ring condensation products is greater than the proportion of other condensation products present in the mixed condensation product.
  • the mixed condensation product described above may also contain condensation products of chemical formula 1 in which n is at least 4, that is condensation products containing at least 6 rings.
  • alkyl phenol formalin condensation products such as Tomilac 224 (trade name) manufactured by API Corporation and the like, for example, can be ideally used.
  • alkyl phenol formalin condensation products may be produced using the method described in the International Publication WO 2002/098674 pamphlet etc.
  • the condensation product may be readily obtained by using a well known synthetic method in which a substituted phenol and a ketone compound or an aldehyde compound are allowed to react in the presence of an acid catalyst, which is, for example, hydrochloric acid, p-toluene sulfonic acid and the like.
  • the reaction is allowed to occur in a suitable organic solvent that can dissolve the starting materials and reaction products and is inert to the reaction, which is, for example, water, methanol, ethanol, n-propyl alcohol, isopropyl alcohol, acetonitrile, toluene, chloroform, diethyl ether, N,N-dimethyl acetamide, benzene, chlorobenzene, dichlorobenzene, diethylketone, ethyl methyl ketone, acetone, tetrahydrofuran and the like, for several hours to several tens of hours at a reaction temperature of 0°C to 150°C. After the reaction, the product is obtained in good yield by removing the unreacted substituted phenol using distillation.
  • a suitable organic solvent that can dissolve the starting materials and reaction products and is inert to the reaction, which is, for example, water, methanol, ethanol, n-propyl alcohol, isopropyl alcohol,
  • substituted phenols phenol, p-chlorophenol, m-chlorophenol, o-chlorophenol, catechol, resorcinol, hydroquinone, p-cresol, m-cresol, o-cresol, p-ethylphenol, m-ethylphenol, o-ethylphenol, p-propylphenol, o-propylphenol, p-isopropylphenol, m-isopropylphenol, o-isopropylphenol, p-t-butylphenol, m-t-butylphenol, o-t-butylphenol, p-t-amylphenol, p-methoxyphenol, m-methoxyphenol, o-methoxyphenol, p-cyanophenol, m-cyanophenol, o-cyanophenol, p-nitrophenol, m-nitrophenol, o-nitrophenol, p-phenylphenol,
  • ketone and aldehyde compounds dimethyl ketone, diethyl ketone, ethyl methyl ketone, methyl isobutyl ketone, formaldehyde, benzaldehyde and the like may be cited but are not limited to the examples.
  • phenol derivatives may be used individually or as mixtures.
  • the diphenyl sulfone derivative used in the present invention as the second color developing agent is represented by the following chemical formula 2.
  • the alkyl groups of R 7 to R 12 represent linear or branched, saturated hydrocarbon groups containing 1 to 12 carbon atoms, and the number of carbon atoms in the saturated hydrocarbon groups is preferably 1 to 5 and more preferably 1 to 4.
  • the alkenyl groups of R 7 to R 12 represent linear or branched unsaturated hydrocarbon groups containing 2 to 12 carbon atoms.
  • vinyl, allyl, isopropenyl, 1-propenyl, 2-butenyl, 3-butenyl, 1,3-butane dienyl,and 2-methyl-2-propenyl groups and the like, for example, may be cited.
  • vinyl groups and ally groups are preferred.
  • q, r, s, t, u and v represent integers of 0 to 4, but 0 to two are preferred and 0 is more preferred. However, when q, r, s, t, u and v are two to four, R 7 to R 12 may be identical to or different from each other, but q, r, s, t, u and v being the same is preferred.
  • Y may independently represent linear or branched, saturated or unsaturated hydrocarbon groups that may also contain ether bonds, but linear saturated hydrocarbons that may also contain ether bonds are preferred and linear saturated hydrocarbons that do not contain ether bonds are more preferred.
  • saturated hydrocarbon groups containing 2 to 6 carbon atoms such as ethylene, trimethylene, tetramethylene, pentamethylene, and hexamethylene groups and the like are preferred.
  • unsaturated hydrocarbon groups of Y linear or branched unsaturated hydrocarbon groups containing 1 to 12 carbon atoms may be cited. Hydrocarbon groups containing 2 to 6 carbon atoms are preferred, and those containing 2 to 4 carbon atoms are more preferred.
  • unsaturated hydrocarbon groups vinylene, ethenylene, propenylene, 2-butenylene, 2-butynylene, and 1-vinylethylene groups and the like may be cited. Of these, aromatic hydrocarbon groups such as propenylene groups, 2-butenylene groups and the like are preferred.
  • hydrocarbon groups containing ether bonds ethylene oxyethylene, tetramethylene oxytetramethylene, ethyleneoxy ethyleneoxy ethylene, ethyleneoxy methyleneoxy ethylene, and 1,3-dioxane-5,5-bismethylene groups and the like, for example, may be cited. Of these, ethylene oxyethylene groups and ethyleneoxy ethyleneoxy ethylene groups are preferred.
  • w represents an integer of 0 to 5, but w that is 0 to two is preferred and 0 is more preferred.
  • the diphenyl sulfone derivative described above may be a compound containing a specific w in the chemical formula 2 or may be a mixture in optional proportion of the compounds of the chemical formula 2 with different w's.
  • diphenyl sulfone derivative of the chemical formula 2 the following compounds, for example, may be cited but examples are not limited to these compounds.
  • the color developing sensitivity declines when a diphenylsulfone derivative is used singly as the color developing agent in a thermosensitive color developing layer but the color developing sensitivity can be improved when a phenol derivative of the present invention is used in combination.
  • a diphenyl sulfone derivative is used in less than the amount of the phenol derivative used, the balance among other properties (color developing sensitivity, moist heat resistance and plasticizer resistance) improves.
  • the ratio at which a phenol derivative that is the color developing agent and a diphenyl sulfone derivative in a thermosensitive color developing layer are used is preferably 95:5 to 55:45, but 90:10 to 60:40 is more preferred.
  • color developing agent than those may also be used in combination in a thermosensitive color developing layer.
  • a color developing agent is preferably used at 50 wt.% or less, more preferably 0 wt.% to 30 wt.% or most preferably not used per the sum of the phenol derivative and diphenylsulfone derivative.
  • color developing agent that can be used in combination in the present invention, all of the well known color developing agents used previously in pressure sensitive or thermosensitive recording media may be used with no specific restrictions.
  • color developing agent includes inorganic acidic substances such as activated clay, attapulgite, colloidal silica, aluminum silicate and the like, 1,1-bis(4-hydroxyphenyl) cyclohexane, hydroquinone monobenzyl ether, benzyl 4-hydroxy benzoate, 3,4-dihydroxyphenyl-4'-methylphenylsulfone, the aminobenzene sulfone amide derivative described in Japanese Patent Application Public Disclosure No.
  • H08-59603 bis (4-hydroxyphenyl thioethoxy) methane, 1,5-di(4-hydroxyphenylthio)-3-oxapentane, butyl bis(p-hydroxyphenyl) acetate, methyl bis(p-hydroxyphenyl) acetate, 1,4-bis[ ⁇ -methyl- ⁇ -(4'-hydroxyphenyl) ethyl] benzene, 1,3-bis[ ⁇ -methyl- ⁇ -(4'-hydroxyphenyl) ethyl] benzene, 2,2'-thio-bis(3-tert-octylphenol), 2,2'-thio-bis(4-tert-octylphenol), the compound described in International Publication WO 2002/081229 pamphlet or Japanese Patent Application Public Disclosure No.
  • aromatic carboxylic acids such as p-chlorobenzoic acid, stearyl gallate, zinc bis[4-(n-octyloxy carbonylamino) salicylate] dihydrate, 4-[2-(p-methoxyphenoxy) ethyloxy] salicylic acid, 4-[3-(p-trisulfonyl) propylenoxy] salicylic acid, 5-[p-(2-p-methoxyphenoxyethoxy) cumyl] salicylic acid; the salts of these aromatic carboxylic acids with polyvalent metals such as zinc, magnesium, aluminum, calcium, titanium, manganese, tin, nickel and the like; and, furthermore, antipyrin complexes of zinc thiocyanate and composite zinc salts of terephthalaldehyde acid with other aromatic carboxylic acid and the like.
  • aromatic carboxylic acids such as p-chlorobenzoic acid, stearyl gallate, zinc bis[4-(n-octyloxy
  • color developing agents may be used individually or as mixtures of at least two.
  • a metal chelate type color developing component such as the high molecular weight fatty acid metal complex salts described in Japanese Patent Application Public Disclosure No. H10-258577 and metal chelate type color developing components such as a polyvalent hydroxyl aromatic compound and the like may also be present.
  • thermosensitive color developing layer of the present invention examples are listed. Binders, crosslinking agents, pigments and the like may be used in the thermosensitive color developing layer in ranges that do not interfere with the desired effects on the tasks described above. In addition, the materials may also be used not only in the thermosensitive color developing layer but also in protective layers and individual coating layers installed as needed.
  • the electron donating leuco dye used in the present invention all of the well known electron donating leuco dyes used previously in pressure sensitive or thermosensitive recording media may be used with no specific restrictions. However, triphenylmethane type compounds, fluorane type compounds, fluorene type compounds, divinyl type compounds and the like are preferred. Specific examples of the typical colorless or pale dye (dye precursors) are shown below. In addition, the dye precursors may be used individually or as mixtures of at least two of them.
  • sensitizer used in the present invention, previously well known sensitizers may be used.
  • Such sensitizer includes, for example, 1,2-di-(3-methylphenoxy) ethane, bis-para-methylbenzyl oxalate, benzyloxy naphthalene, 1,2-di-(3-methylphenoxy) ethane, aliphatic acid amides such as stearic acid amide, palmitic acid amide and the like, ethylene bis-amide, montanoic acid wax, polyethylene wax, p-benzyl biphenyl, ⁇ -benzyloxy naphthalene, 4-biphenyl-p-tolyl ether, m-terphenyl, 1,2-diphenoxy ethane, dibenzyl oxalate, di-(p-chlorobenzyl) oxalate, dibenzyl terephthalate, benzyl p-benzyloxybenzoate, di-p-tolyl
  • 1,2-di-(3-methylphenoxy) ethane, bis-p-methylbenzyl oxalate and benzyloxy naphthalene are preferred since they yield good color developing sensitivity when they are combined with a color developing agent of the present invention.
  • 4,4'-butylidene (6-t-butyl-3-methylphenol), 2,2'-di-t-butyl-5,5'-dimethyl-4,4'-sulfonyl diphenol, 1,1,3-tris(2-methyl-4-hydroxy-5-cyclohexylphenyl) butane, 1,1,3-tris(2-methyl-4-hydroxy-5-t-butylphenyl) butane and the like may be used in combination in ranges that do not interfere with the desired effects on the tasks described above.
  • thermosensitive recording medium of the present invention a binder, a list of examples of which include completely saponified poly(vinyl alcohol), partially saponified poly(vinyl alcohol), acetoacetylated poly(vinyl alcohol), carboxyl modified poly(vinyl alcohol), amide modified poly(vinyl alcohol), sulfonic acid modified poly(vinyl alcohol), butyral modified poly(vinyl alcohols), olefin modified poly(vinyl alcohol), nitrile modified poly(vinyl alcohol), pyrrolidone modified poly(vinyl alcohol), silicone modified poly(vinyl alcohol), other modified poly(vinyl alcohols), hydroxyethyl cellulose, methyl cellulose, ethyl cellulose, carboxymethyl cellulose, styrene-maleic anhydride copolymer, styrene-butadiene copolymer as well as cellulose derivatives such as ethyl cellulose and acetyl cellulose, casein,
  • crosslinking agent used in the present invention glyoxal, methylol melamine, melamine formaldehyde resins, melamine urea resins, polyamine epichlorohydrin resins, polyamide epichlorohydrin resins, potassium persulfate, ammonium persulfate, sodium persulfate, ferric chloride, magnesium chloride, borax, boric acid, alum, ammonium chloride and the like may be listed as examples.
  • inorganic and organic fillers such as silica, calcium carbonate, kaolin, calcined kaolin, diatomaceous earth, talc, titanium oxide, aluminum hydroxide and the like may be cited.
  • fatty acid metal salts such as zinc stearate, calcium stearate and the like, wax, silicone resins and the like may be cited.
  • ultraviolet ray absorption agents dispersion agents, defoaming agents, oxidation inhibitors, fluorescent dye and the like may also be used.
  • the types and amounts of the dye, color developing agents and various other components used in the thermosensitive color developing layer of the present invention are decided according to performance and recording properties.
  • the amounts are not particularly limited, but the color developing agent is ordinarily used at about 0.5 to 10 weight parts per one part of dye, the sensitizer is used at about 0.5 to 10 weight parts, the stabilizing agent is used at about 0.01 to 10 weight parts and other components are used at about 0.01 to 10 weight parts.
  • the dye, color developing agent and other materials added when needed are ground into particles several microns in size or smaller using a grinder or emulsification device such as a ball mill, attriter, sand grinder and the like.
  • a binder and various additives are added depending on the objective of preparing a coating solution. Water, an alcohol and the like may be used as the solvent used to prepare the coating solution, and the solid fraction is present at about 20 wt.% to 40 wt.%.
  • a protective layer containing as main components pigments and water soluble polymers such as poly(vinyl alcohol), starch and the like may also be installed on a thermosensitive color developing layer in a thermosensitive recording medium of the present invention.
  • the presence of a resin containing carboxyl groups, particularly poly(vinyl alcohol) modified with carboxyl groups, and epichlorohydrin type resins and polyamine type resin/polyamide type resins in the protective layer are desirable from the standpoints of heat, water and moist heat resistance.
  • an epichlorohydrin type resin and a polyamine type resin/polyamide type resin in the protective layer of the present invention is desirable. Adequate water resistance cannot be obtained when they are individually used, and blocking and other problems are encountered. In addition, adequate water resistance cannot be obtained even when other common crosslinking agents, for example, glyoxal and epichlorohydrin type resins or polyamine type resin/polyamide type resins are used in combination.
  • the resin containing carboxyl groups used as the binder in a protective layer in the present invention may be any one as long as it contains mainly carboxyl groups.
  • a resin that contains monofunctional acrylic monomer containing carboxyl groups such as methacrylic acid, 2-hydroxyethyl methacrylate, 2-hydroxypropyl methacrylate, dimethyl aminoethyl methacrylate, diethyl aminoethyl methacrylate, t-butyl aminoethyl methacrylate, glycidyl methacrylate, tetrahydro furfuryl methacrylate and the like, oxidized starch, carboxymethyl cellulose, poly(vinyl alcohol) modified with carboxyl groups obtained by introducing carboxyl groups to poly(vinyl alcohol) and the like may be cited.
  • the use of a carboxyl modified poly(vinyl alcohol) with excellent heat and solvent resistance is particularly preferred.
  • the carboxyl modified poly(vinyl alcohol) used in the present invention is a water soluble polymer into which carboxyl groups have been introduced for the purpose of enhancing the reactivity and is a reaction product of poly(vinyl alcohol) with a polyvalent carboxylic acid such as fumaric acid, phthalic anhydride, mellitic anhydride, itaconic anhydride and the like or an ester of the reaction product, or a saponified copolymer of vinyl acetate with a dicarboxylic acid with ethylene type unsaturation such as maleic acid, fumaric acid, itaconic acid, crotonic acid, acrylic acid, methacrylic acid and the like. More specifically, the product is obtained using the production process listed as examples in, for example, Japanese Patent Application Public Disclosure No. S53-91995 .
  • the carboxyl modified poly(vinyl alcohol) used in the present invention has a low Hercules viscosity. That is, the material is very fluid under high shear conditions but is viscous under low shear force conditions. For that reason, a coating fluid spreads smoothly when applied but forms a coating layer that solidifies immediately after application, is uniform and smooth. Thus the image quality of printed images and sensitivity are thought to improve.
  • carboxyl modified poly(vinyl alcohol) has excellent water retention, and the binder penetration into the support material can be suppressed. The feature allows a smooth coating layer to form and is thought to improve image quality and sensitivity.
  • the degree of polymerization and saponification of the carboxyl modified poly(vinyl alcohol) used in the present invention may be appropriately selected based on the water retention of the coating and the surface strength of the coating layer.
  • epichlorohydrin type resin used in the present invention
  • polyamide epichlorohydrin resins, polyamine epichlorohydrin resins and the like may be cited and may be used individually or jointly.
  • the amine present in the main chain of the epichlorohydrin type resin primary to quaternary amines may be used without particular restrictions.
  • a degree of cationization of 5 meq/g• solid or less (measured at pH 7) and a molecular weight of at least 500,000 are preferred based on good water resistance.
  • Sumirez resin 650 (30), Sumirez resin 675A, Sumirez resin 6615 (all manufactured by Sumitomo Kagaku), WS 4002, WS 4020, WS 4024, WS 4030, WS 4046, WS 4010, CP 8970 (all manufactured by Seiko PMC Corporation) and the like may be cited.
  • the polyamine type resin/polyamide type resin signifies a polyamine type resin and/or polyamide type resin and the polyamine type resin/polyamide type resin includes polyamine resins, polyamide resins, polyamide urea type resins, poly(ethylene imine) resins, polyalkylene polyamine resins, polyalkylene polyamide resins, polyamine polyurea type resins, modified polyamine resins, modified polyamide resins, polyalkylene polyamine urea formalin resins, polyalkylene polyamine polyamide polyurea resins and the like. They may be used alone or in combinations of at least two of them. As specific examples, Sumirez resin 302 (a polyamine polyurea type resin manufactured by Sumitomo Chemical Co.
  • Sumirez resin 712 (a polyamine polyurea type resin manufactured by Sumitomo Chemical Co. Ltd.), Sumirez 703 (a polyamine polyurea type resin manufactured by Sumitomo Chemical Co. Ltd.), Sumirez 636 (a polyamine polyurea type resin manufactured by Sumitomo Chemical Co. Ltd.), Sumirez resin SPI-100 (a modified polyamine resin manufactured by Sumitomo Chemical Co. Ltd.), Sumirez resin SPI-102A (a modified polyamide resin manufactured by Sumitomo Chemical Co. Ltd.), Sumirez resin SPI-106N (a modified polyamide resin manufactured by Sumitomo Chemical Co.
  • polyamine type resins polyalkylene polyamine resins, polyamine polyurea type resins, modified polyamine resins, polyalkylene polyamine urea formalin resins, polyalkylene polyamine polyamide polyurea resins
  • polyamine type resins polyalkylene polyamine resins, polyamine polyurea type resins, modified polyamine resins, polyalkylene polyamine urea formalin resins, polyalkylene polyamine polyamide polyurea resins
  • the concentrations of the epichlorohydrin type resin and polyamine type resin/polyamide type resin used in the present invention are preferably 1 to 100 parts by weight, more preferably 5 to 50 parts by weight, respectively, per 100 parts by weight of the carboxyl modified poly(vinyl alcohol).
  • concentrations are too low, the crosslinking reaction is inadequate and good water resistance cannot be obtained.
  • concentrations are too high, operational problems are experienced due to viscosity increases in the coating solution and gel formation.
  • epichlorohydrin type resins undergo crosslinking reactions at pH of 6.0 or higher, and the pH of the protective layer coating is preferably adjusted to 6.0 or higher.
  • the types and amounts of various components used in the protective layer of the present invention are decided according to the performance and recording properties.
  • the amounts are not particularly limited, but the poly(vinyl alcohol) is ordinarily used at 10 to 500 parts by weight per 100 parts by weight of the pigment and the crosslinking agent component is used at 1 to 100 parts by weight per 100 parts by weight of the poly(vinyl alcohol) .
  • the materials are ground into fine particles several microns or smaller in size using a grinder or suitable emulsification device such as a ball mill, an attriter, a sand grinder and the like.
  • a binder and various additives are added depending on the objective to prepare a coating solution.
  • Water, alcohol and the like may be used as the solvent to prepare the coating solution, and the solid fraction is present at about 20 wt.% to 40 wt.%.
  • the pigment used in a protective layer of the present invention may be kaolin, (calcined) kaolin, calcium carbonate, aluminum oxide, titanium oxide, magnesium carbonate, aluminum silicate, magnesium silicate, calcium silicate, aluminum hydroxide, diatomaceous earth, talc and the like.
  • concentrations of the pigment and binder in the protective layer of the present invention are about 30 to 300 parts by weight in terms of the solid fraction of the binder per 100 parts by weight of the pigment.
  • thermosensitive color developing layer a recording layer
  • protective layer when necessary were formed on one side of a support material.
  • parts and % indicate parts by weight and wt.%, respectively.
  • thermosensitive recording medium The individual coating solutions for a thermosensitive recording medium were prepared as described below.
  • the mixture comprising the composition described above was blended and agitated to prepare an undercoating layer coating solution.
  • the solutions A through D were separately wet ground using sand grinders until the average particle size was about 0.5 ⁇ m.
  • Alkylphenol formalin condensation product (Tomilac 224 manufactured by API Corporation) 6.0 parts 10% Aqueous solution of poly(vinyl alcohol) 5.0 parts Water 1.5 parts
  • Diphenylsulfone crosslinking type compound (D-90* manufactured by Nippon Soda Co., Ltd.) 6.0 parts 10% Aqueous solution of poly(vinyl alcohol) 5.0 parts Water 1.5 parts *D-90 is represented by the formula below.
  • BPS-MAE* 4-Hydroxy-4'-allyloxy diphenyl sulfone (BPS-MAE* manufactured by Nicca Chemical Co., Ltd.) 6.0 parts 10% Aqueous solution of poly(vinyl alcohol) 5.0 parts Water 1.5 parts *BPS-MAE is represented by the formula 11 below.
  • 2,4'-Dihydroxy diphenyl sulfone (2,4 Bisphenol S* manufactured by Nicca Chemical Co., Ltd.) 6.0 parts 10% Aqueous solution of poly(vinyl alcohol) 5.0 parts Water 1.5 parts *2,4 Bisphenol S is represented by the formula 6 below.
  • N-(4'-hydroxyphenylthio) acetyl-2-hydroxyaniline (D-102* manufactured by Nippon Soda Co., Ltd.) 6.0 parts 10%
  • Aqueous solution of poly(vinyl alcohol) 5.0 parts
  • Water 1.5 parts *D-102 is represented by the formula 12 below:
  • BPA Bisphenol A (BPA* manufactured by Mitsui Chemical, Inc.) 6.0 parts 10% Aqueous solution of poly(vinyl alcohol) 5.0 parts Water 1.5 parts *BPA is represented by the following formula 13 below:
  • BisP-AP (Bisphenol AP* manufactured by Honshu Chemical Industry Co. Ltd.) 6.0 parts 10% Aqueous solution of poly(vinyl alcohol) 5.0 parts Water 1.5 parts *Bisphenol AP is represented by the formula 14 below.
  • thermosensitive color developing layer coating solution 1 A-1 solution (the first color developing agent dispersion) 18.0 parts
  • Solution B the second color developing agent dispersion) 18.0 parts
  • Solution C basic colorless dye dispersion
  • D-1 solution sensitizer dispersion
  • Silica P537, 25% dispersion, manufactured by Mizusawa Industrial Chemicals, Ltd.
  • thermosensitive color developing layer coating solution 2 A-4 solution (the first color developing agent dispersion) 36.0 parts
  • thermosensitive color developing layer coating solution 3 A-3 solution (the first color developing agent dispersion) 36.0 parts
  • Solution B the second color developing agent dispersion) 36.0 parts
  • Solution C basic colorless dye dispersion
  • D-1 solution sensitizer dispersion
  • Silica P537, 25% dispersion, manufactured by Mizusawa Industrial Chemicals, Ltd.
  • thermosensitive color developing layer coating solution 4 A-7 solution (the first color developing agent dispersion) 36.0 parts
  • Solution B the second color developing agent dispersion) 36.0 parts
  • Solution C basic colorless dye dispersion
  • D-3 solution sensitizer dispersion
  • Silica P537, 25% dispersion, manufactured by Mizusawa Industrial Chemicals, Ltd.
  • thermosensitive color developing layer coating solution 5 A-9 solution (the first color developing agent dispersion) 36.0 parts
  • Solution B the second color developing agent dispersion) 36.0 parts
  • Solution C basic colorless dye dispersion
  • D-4 solution sensitizer dispersion
  • Silica P537, 25% dispersion, manufactured by Mizusawa Industrial Chemicals, Ltd.
  • thermosensitive color developing layer coating solution 6 A-10 solution (the first color developing agent dispersion) 54.0 parts
  • Solution B the second color developing agent dispersion) 18.0 parts
  • Solution C basic colorless dye dispersion
  • D-2 solution sensitizer dispersion
  • Silica P537, 25% dispersion, manufactured by Mizusawa Industrial Chemicals, Ltd.
  • a mixture comprising the composition described above was blended and agitated to prepare a protective layer coating solution.
  • thermosensitive layer coating solution was applied to one side of a free paper (47 g/m 2 substrate) using a Mayer bar at a coating rate of 10.0 g/m 2 and was dried (for 2 minutes using a forced air dryer at 60°C) to prepare an undercoated paper.
  • a thermosensitive recording medium was obtained by applying a thermosensitive color developing layer coating solution 1 on the undercoating layer of the undercoated paper at a coating rate of 6.0 g/m 2 and drying (for 2 minutes using a forced air dryer at 60°C). The sheet was super calendared to a degree of smoothness of 500 to 1,000 seconds to yield a thermosensitive recording medium.
  • thermosensitive recording medium was prepared in the same manner described in Example 1 with the exception that the amount of A-1 solution used was changed to 27 parts and the amount of solution B used was changed to 9 parts.
  • thermosensitive recording medium was prepared in the same manner described in Example 1 with the exception that the amount of A-1 solution used was changed to 30 parts and the amount of solution B used was changed to 6 parts.
  • thermosensitive recording medium was prepared in the same manner described in Example 1 with the exception that the amount of A-1 solution used was changed to 9 parts and the amount of solution B used was changed to 27 parts.
  • thermosensitive recording medium was prepared in the same manner described in Example 1 with the exception that the amount of A-1 solution used was changed to 6 parts and the amount of solution B used was changed to 30 parts.
  • thermosensitive recording medium was prepared in the same manner described in Example 1 with the exception that the amount of A-1 solution used was changed to 36 parts, the amount of solution B used was changed to 36 parts and D-1 solution was changed to D-2 solution.
  • thermosensitive recording medium was prepared in the same manner described in Example 6 with the exception that the amount of A-1 solution used was changed to 54 parts and the amount of solution B used was changed to 18 parts.
  • thermosensitive recording medium was prepared in the same manner described in Example 7 with the exception that D-1 solution was changed to D-3 solution.
  • thermosensitive recording medium was prepared in the same manner described in Example 7 with the exception that D-1 solution was changed to D-4 solution.
  • thermosensitive recording medium was prepared in the same manner described in Example 6 with the exception that the amount of A-1 solution used was changed to 64 parts and the amount of solution B used was changed to 8 parts.
  • thermosensitive color developing layer coating solution in the procedure described in Example 1 was changed to 7.5 parts, and a thermosensitive recording medium was prepared.
  • a protective layer coating solution was applied at a coating rate of 3 g/m 2 and was dried (for 2 minutes using a forced air dryer at 60°C) to prepare a thermosensitive recording medium.
  • thermosensitive color developing layer coating solution in the procedure described in Example 2 was changed to 7.5 parts, and a thermosensitive recording medium was prepared.
  • a protective layer coating solution was applied at a coating rate of 3 g/m 2 and was dried (for 2 minutes using a forced air dryer at 60°C) to prepare a thermosensitive recording medium.
  • thermosensitive color developing layer coating solution in the procedure described in Example 3 was changed to 7.5 parts, and a thermosensitive recording medium was prepared.
  • a protective layer coating solution was applied at a coating rate of 3 g/m 2 and was dried (for 2 minutes using a forced air dryer at 60°C) to prepare a thermosensitive recording medium.
  • thermosensitive recording medium was prepared in the same manner described in Example 1 with the exception of using 36 parts of A-1 solution and no solution B.
  • thermosensitive recording medium was prepared in the same manner described in Example 1 with the exception of using 36 parts of solution B and no A-1 solution.
  • thermosensitive recording medium was prepared in the same manner described in Example 6 with the exception of changing solution A-1 to solution A-2.
  • thermosensitive recording medium was prepared in the same manner described in Example 7 with the exception of changing solution A-1 to solution A-2.
  • thermosensitive recording medium was prepared in the same manner described in Example 7 with the exception of changing solution B to solution A-2.
  • thermosensitive recording medium was prepared in the same manner described in Example 1 with the exception of changing solution B to solution A-3.
  • thermosensitive color developing layer coating solution in the procedure described in Comparative Example 1 was changed to 7.5 parts, and a thermosensitive recording medium was prepared.
  • a protective layer coating solution was applied at a coating rate of 3 g/m 2 and was dried (for 2 minutes using a forced air dryer at 60°C) to prepare a thermosensitive recording medium.
  • thermosensitive layer coating solution was applied to one side of a free paper (47 g/m 2 substrate) using a Mayer bar at a coating rate of 10.0 g/m 2 and was dried (for 2 minutes using a forced air dryer at 60°C) to prepare an undercoated paper.
  • a thermosensitive recording medium was obtained by applying a thermosensitive color developing layer coating solution 2 on the undercoating layer of the undercoated paper at a coating rate of 6.0 g/m 2 and drying (for 2 minutes using a forced air dryer at 60°C). The sheet was super calendared to a degree of smoothness of 500 to 1,000 seconds to yield a thermosensitive recording medium.
  • thermosensitive recording medium The amount of silica in the procedure described in Example 14 was changed to 7.5 parts, and a thermosensitive recording medium was prepared.
  • a protective layer coating solution was applied at a coating rate of 3 g/m 2 and was dried (for 2 minutes using a forced air dryer at 60°C) to prepare a thermosensitive recording medium.
  • thermosensitive recording medium was prepared in the same manner described in Example 14 with the exception of using 18 parts of A-4 and 54 parts of solution B in the thermosensitive color developing coating solution.
  • thermosensitive recording medium was prepared in the same manner described in Example 14 with the exception of using 54 parts of A-4 and 18 parts of solution B in the thermosensitive color developing coating solution.
  • thermosensitive recording medium was prepared in the same manner described in Example 17 with the exception of changing solution D-1 to solution D-2..
  • thermosensitive recording medium was prepared in the same manner described in Example 14 with the exception of using 72 parts of A-4 and no solution B in the thermosensitive color developing coating solution.
  • thermosensitive recording medium was prepared in the same manner described in Example 14 upon changing solution B to solution A-5 in the thermosensitive color developing coating solution.
  • thermosensitive recording medium was prepared in the same manner described in Example 14 upon changing solution B to solution A-2 in the thermosensitive color developing coating solution.
  • thermosensitive recording medium was prepared in the same manner described in Comparative Example 10 upon changing the amount of solution A-4 used to 18 parts and the amount of solution B used to 54 parts.
  • thermosensitive layer coating solution was applied to one side of a free paper (47 g/m 2 substrate) using a Mayer bar at a coating rate of 10.0 g/m 2 and was dried (for 2 minutes using a forced air dryer at 60°C) to prepare an undercoated paper.
  • a thermosensitive recording medium was obtained by applying a thermosensitive color developing layer coating solution 3 on the undercoating layer of the undercoated paper at a coating rate of 6.0 g/m 2 and drying (for 2 minutes using a forced air dryer at 60°C). The sheet was super calendared to a degree of smoothness of 500 to 1,000 seconds to yield a thermosensitive recording medium.
  • thermosensitive recording medium was prepared using the same procedure described in Example 19 with the exception of changing the solution A-3 in the color developing layer coating solution to the solution A-5.
  • thermosensitive recording medium was prepared using the same procedure described in Example 19 with the exception of changing the solution A-3 in the color developing layer coating solution to the solution A-6.
  • thermosensitive recording medium was prepared using the same procedure described in Example 21 with the exception of changing the amount of solution A-6 used to 54 parts and the amount of solution B to 18 parts.
  • thermosensitive recording medium was prepared using the same procedure described in Example 21 with the exception of changing the amount of solution A-6 used to 18 parts and the amount of solution B to 54 parts.
  • thermosensitive recording medium The amount of silica in the procedure described in Example 19 was changed to 7.5 parts, and a thermosensitive recording medium was prepared.
  • a protective layer coating solution was applied at a coating rate of 3 g/m 2 and was dried (for 2 minutes using a forced air dryer at 60°C) to prepare a thermosensitive recording medium.
  • thermosensitive recording medium was prepared in the same manner described in Example 19 with the exception of changing solution A-3 to solution A-5 and solution D-1 to solution D-2.
  • thermosensitive recording medium was prepared in the same manner described in Example 25 with the exception of using 54 parts of A-5 and 18 parts of solution B in the thermosensitive color developing coating solution.
  • thermosensitive recording medium was prepared in the same manner described in Example 25 with the exception of using 64 parts of A-5 and 8 parts of solution B in the thermosensitive color developing coating solution.
  • thermosensitive recording medium was prepared in the same manner described in Example 26 with the exception of changing solution D-2 to solution D-3.
  • thermosensitive recording medium was prepared in the same manner described in Example 26 with the exception of changing solution D-2 to solution D-4.
  • thermosensitive recording medium was prepared in the same manner described in Example 26 with the exception of changing solution A-5 to solution A-6.
  • thermosensitive recording medium was prepared in the same manner described in Example 26 with the exception of changing solution A-5 to solution A-3.
  • thermosensitive recording medium was prepared in the same manner described in Example 19 with the exception of using 72 parts of A-3 and no solution B in the thermosensitive color developing coating solution.
  • thermosensitive recording medium was prepared in the same manner described in Example 19 upon changing solution B to solution A-5 in the thermosensitive color developing coating solution.
  • thermosensitive recording medium was prepared in the same manner described in Example 19 upon changing solution B to solution A-2 in the thermosensitive color developing coating solution.
  • thermosensitive recording medium was prepared in the same manner described in Comparative Example 14 upon changing the amount of solution A-3 used to 18 parts and the amount of solution A-2 used to 54 parts.
  • thermosensitive layer coating solution was applied to one side of a free paper (47 g/m 2 substrate) using a Mayer bar at a coating rate of 10.0 g/m 2 and was dried (for 2 minutes using a forced air dryer at 60°C) to prepare an undercoated paper.
  • a thermosensitive recording medium was obtained by applying a thermosensitive color developing layer coating solution 4 on the undercoating layer of the undercoated paper at a coating rate of 6.0 g/m 2 and drying (for 2 minutes using a forced air dryer at 60°C). The sheet was super calendared to a degree of smoothness of 500 to 1,000 seconds to yield a thermosensitive recording medium.
  • thermosensitive recording medium was prepared in the same manner described in Example 32 upon changing solution A-7 to 54 parts and solution B to 18 parts in the thermosensitive color developing coating solution.
  • thermosensitive recording medium was prepared in the same manner described in Example 32 with the exception of changing solution A-7 to 18 parts and solution B to 54 parts in the thermosensitive color developing coating solution.
  • thermosensitive recording medium was prepared in the same manner described in Example 32 with the exception of changing the solution D-3 used to solution D-2.
  • thermosensitive recording medium was prepared in the same manner described in Example 33 with the exception of changing the solution D-3 used to solution D-2.
  • thermosensitive color developing layer coating solution 4 The amount of silica added to the thermosensitive color developing layer coating solution 4 in the procedure described in Example 32 was changed to 7.5 parts, and a thermosensitive recording medium was prepared.
  • a protective layer coating solution was applied at a coating rate of 3 g/m 2 and was dried (for 2 minutes using a forced air dryer at 60°C) to prepare a thermosensitive recording medium.
  • thermosensitive recording medium was prepared in the same manner described in Example 32 with the exception of using 72 parts of solution B and no solution A-7.
  • thermosensitive recording medium was prepared in the same manner described in Example 32 with the exception of using 72 parts of A-7 and no solution B in the thermosensitive color developing coating solution.
  • thermosensitive color developing layer coating solution in the procedure described in Comparative Example 17 was changed to 7.5 parts, and a thermosensitive recording medium was prepared.
  • a protective layer coating solution was applied at a coating rate of 3 g/m 2 and was dried (for 2 minutes using a forced air dryer at 60°C) to prepare a thermosensitive recording medium.
  • thermosensitive layer coating solution was applied to one side of a free paper (47 g/m 2 substrate) using a Mayer bar at a coating rate of 10.0 g/m 2 and was dried (for 2 minutes using a forced air dryer at 60°C) to prepare an undercoated paper.
  • a thermosensitive recording medium was obtained by applying a thermosensitive color developing layer coating solution 5 on the undercoating layer of the undercoated paper at a coating rate of 6.0 g/m 2 and drying (for 2 minutes using a forced air dryer at 60°C). The sheet was super calendared to a degree of smoothness of 500 to 1,000 seconds to yield a thermosensitive recording medium.
  • thermosensitive recording medium was prepared in the same manner described in Example 38 with the exception of changing the solution D-4 used to solution D-3.
  • thermosensitive recording medium was prepared in the same manner described in Example 38 with the exception of changing the solution A-9 to 27 parts and solution B to 9 parts and changing solution D-4 used to solution D-2 in the thermosensitive color developing layer coating solution.
  • thermosensitive recording medium was prepared in the same manner described in Example 38 with the exception of changing the solution D-4 used in the thermosensitive color developing layer coating solution to solution D-2.
  • thermosensitive recording medium was prepared in the same manner described in Example 38 with the exception of changing the solution D-4 used in the thermosensitive color developing layer coating solution to solution D-1.
  • thermosensitive recording medium was prepared in the same manner described in Example 38 with the exception of changing the dye in solution C (a dye dispersion) to 3-N-di-n-pentylamino-6-methyl-7-anilinofluorane (BLACK 305 manufactured by Yamada Chemical Co., Ltd.).
  • thermosensitive recording medium was prepared in the same manner described in Example 38 with the exception of changing the solution A-9 used in the thermosensitive color developing layer coating solution to solution A-8.
  • thermosensitive recording medium was prepared in the same manner described in Example 41 with the exception of changing the solution A-9 used in the thermosensitive color developing layer coating solution to solution A-8.
  • thermosensitive recording medium was prepared in the same manner described in Example 40 with the exception of changing the solution A-9 used in the thermosensitive color developing layer coating solution to solution A-8.
  • thermosensitive recording medium The amount of silica in the procedure described in Example 38 was changed to 7.5 parts, and a thermosensitive recording medium was prepared.
  • a protective layer coating solution was applied at a coating rate of 3 g/m 2 and was dried (for 2 minutes using a forced air dryer at 60°C) to prepare a thermosensitive recording medium.
  • thermosensitive recording medium was prepared in the same manner described in Example 47 with the exception of changing the solution A-9 used in the thermosensitive color developing layer coating solution to solution A-8.
  • thermosensitive recording medium was prepared in the same manner described in Example 47 with the exception of changing the amount of solution A-9 to 24 parts and solution B to 12 parts in the thermosensitive color developing layer coating solution.
  • thermosensitive recording medium was prepared in the same manner described in Example 47 with the exception of changing the amount of solution A-9 to 12 parts and solution B to 24 parts in the thermosensitive color developing layer coating solution.
  • thermosensitive recording medium was prepared in the same manner described in Example 38 with the exception of changing the amount of solution B to 36 parts and using no solution A-9 in the thermosensitive color developing layer coating solution.
  • thermosensitive recording medium was prepared in the same manner described in Example 38 with the exception of changing the amount of solution A-9 to 36 parts and using no solution B in the thermosensitive color developing layer coating solution.
  • thermosensitive recording medium was prepared in the same manner described in Example 38 with the exception of changing the solution B used in the thermosensitive color developing layer coating solution to solution A-3.
  • thermosensitive recording medium was prepared by using 7.5 parts of silica in the thermosensitive color developing layer coating solution of Comparative Example 21.
  • a protective layer coating solution was applied at a coating rate of 3 g/m 2 and dried (for 2 minutes using a forced air dryer at 60°C) to prepare a thermosensitive recording medium.
  • thermosensitive layer coating solution was applied to one side of a free paper (47 g/m 2 substrate) using a Mayer bar at a coating rate of 10.0 g/m 2 and was dried (for 2 minutes using a forced air dryer at 60°C) to prepare an undercoated paper.
  • a thermosensitive recording medium was obtained by applying a thermosensitive color developing layer coating solution 6 on the undercoating layer of the undercoated paper at a coating rate of 6.0 g/m 2 and drying (for 2 minutes using a forced air dryer at 60°C). The sheet was super calendared to a degree of smoothness of 500 to 1,000 seconds to yield a thermosensitive recording medium.
  • thermosensitive recording medium was prepared in the same manner described in Example 51 with the exception of changing the amount of solution A-10 to 64 parts and the amount of solution B to 8 parts in the thermosensitive color developing layer coating solution.
  • thermosensitive recording medium was prepared in the same manner described in Example 51 with the exception of changing the solution A-10 used in the thermosensitive color developing layer coating solution to solution A-11.
  • thermosensitive recording medium was prepared in the same manner described in Example 51 with the exception of changing the amount of solution B to 36 parts and using no solution A-10 in the thermosensitive color developing layer coating solution.
  • thermosensitive recording medium was prepared in the same manner described in Example 51 with the exception of changing the amount of solution B to 72 parts and using no solution A-10 in the thermosensitive color developing layer coating solution.
  • thermosensitive recording medium was prepared in the same manner described in Example 51 with the exception of changing the amount of solution A-10 to 72 parts and using no solution B in the thermosensitive color developing layer coating solution.
  • thermosensitive recording medium was prepared in the same manner described in Example 53 with the exception of changing the amount of solution A-11 to 72 parts and using no solution B in the thermosensitive color developing layer coating solution.
  • thermosensitive recording media obtained in the examples and comparative examples above were subjected to the following evaluations.
  • thermosensitive recording medium printer TH-PMD manufactured by Ohkura Engineering Co., Ltd. was used to print checks at an applied energy of 0.35 mJ/dot.
  • the color developed section was examined using a Macbeth Densitometer.
  • Dia Wrap manufactured by Mitsubishi Plastics, Inc. was brought in contact with the front and back of the thermosensitive recording medium printed in the sensitivity test 1 and was left standing for 24 hours in an environment where the temperature was 50°C and humidity was 90%.
  • the print density (intensity of the printed section) of the color developed section was measured, and the image remaining rate was calculated using the values before and after the test.
  • Image remaining rate print section intensity after testing / print section intensity before testing x 100 % Rating:
  • Dia Wrap manufactured by Mitsubishi Plastics, Inc. was brought in contact with the front and back of the thermosensitive recording medium printed in the sensitivity test 1 and was left standing for 24 hours in an environment where the temperature was 40°C and humidity was 90%.
  • the print density (intensity of the printed section) of the color developed section was measured, and the image remaining rate was calculated using the values before and after the test.
  • Image remaining rate print section intensity after testing / print section intensity before testing x 100 % Rating:
  • thermosensitive recording medium printed with a bar code (CODE39) using a label printer 140XiIII manufactured by Zebra Co., Ltd. was brought in contact with Dia Wrap (manufactured by Mitsubishi Plastics, Inc.) and was left standing for 24 hours in an environment where the temperature was 40°C and humidity was 90%.
  • a bar code reader (Quick Check PC 600 manufactured by Nihon Systex Ltd.) was used for the evaluation. The evaluation was conducted using the ANSI grades (used ten of measaurements) and the manner described below. Now, a rating C or better result meant that no practical problem was experienced when reading bar codes. Similarly, a rating D or poorer result meant that problems were encountered as far as bar code readability was concerned. Rating: (Excellent) A>B>C>D>F (Poor)
  • thermosensitive recording medium printer TH-PMD manufactured by Ohkura Engineering Co., Ltd. was used to print checks at applied energy of 0.28 mJ/dot.
  • the color developed section was examined using a Macbeth Densitometer.
  • Dia Wrap manufactured by Mitsubishi Plastics, Inc. was brought in contact with the front and back of the thermosensitive recording medium printed in the sensitivity test 2 and was left standing for 24 hours in an environment where the temperature was 40°C and humidity was 90%.
  • the print density (intensity of the printed section) of the color developed section was measured, and the image remaining rate was calculated using the values before and after the test.
  • Image remaining rate print section intensity after testing / print section intensity before testing x 100 % Rating:
  • thermosensitive recording medium printed with a bar code CODE39
  • a label printer 140XiIII manufactured by Zebra Co., Ltd. was brought in contact with Dia Wrap (manufactured by Mitsubishi Plastics, Inc.) and was left standing for 24 hours in an environment where the temperature was 40°C and humidity was 90%.
  • a bar code reader Quality Check PC 600 manufactured by Nihon Systex Ltd. was used for the evaluation.
  • thermosensitive recording medium printed with a bar code CODE39
  • a label printer 140XiIII manufactured by Zebra Co., Ltd. was brought in contact and was left standing for 24 hours in an environment where the temperature was 90°C.
  • a bar code reader Quantick Check PC 600 manufactured by Nihon Systex Ltd.
  • the evaluation was conducted using the ANSI grades (used ten of measaurements) and the manner described below. Now, a rating C or better result meant that no practical problem was experienced when reading bar codes. Similarly, a rating D or poorer result meant that problems were encountered as far as bar code readability was concerned. Rating: (Excellent) A>B>C>D>F (Poor)
  • thermosensitive recording medium printer TH-PMD manufactured by Ohkura Engineering Co., Ltd. was used to print checks at applied energy of 0.35 mJ/dot.
  • the thermosensitive recording medium thus printed was left standing for 72 hours in an environment where the temperature was 50°C and humidity was 90%.
  • the print density of the color developed section (printed section intensity) was measured, and the image remaining rate was calculated using the values before and after the test.
  • Image remaining rate print section intensity after testing / print section intensity before testing x 100 % Rating:
  • thermosensitive recording medium printer TH-PMD manufactured by Ohkura Engineering Co., Ltd. was used to print checks at applied energy of 0.35 mJ/dot.
  • the thermosensitive recording medium thus printed was irradiated with ultraviolet rays for 24 hours using a Xenon Fadometer, and the print density of the color developed section (printed section intensity) was measured.
  • the image remaining rate was calculated from the values before and after the test.
  • Image remaining rate print section intensity after testing / print section intensity before testing x 100 % Rating:
  • thermosensitive recording medium printer TH-PMD manufactured by Ohkura Engineering Co., Ltd. was used to print checks at applied energy of 0.35 mJ/dot.
  • the thermosensitive recording medium thus printed was treated for 24 hours at an output of 67 W/m 2 using a Xenon Fadometer model Ci3000F manufactured by Atlas Co., Ltd., and the print density of the color developed section (printed section intensity) before and after the treatment was measured to calculate the image remaining rate.
  • Image remaining rate print section intensity after testing / print section intensity before testing x 100 % Rating:
  • thermosensitive recording medium containing a phenol derivative represented by the chemical formula 1 as the first color developing agent and a diphenyl sulfone derivative represented by the chemical formula 2 as the second color developing agent in the thermosensitive color developing layer was shown to have excellent color developing sensitivity, moist heat resistance, heat resistance, plasticizer resistance and the like.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Heat Sensitive Colour Forming Recording (AREA)
EP08827733.0A 2007-08-21 2008-08-21 Thermosensitive recording medium Active EP2181853B1 (en)

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
JP2007214392 2007-08-21
JP2007241896 2007-09-19
JP2007246765 2007-09-25
JP2007258371 2007-10-02
JP2007259378 2007-10-03
PCT/JP2008/064904 WO2009025316A1 (ja) 2007-08-21 2008-08-21 感熱記録体

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EP2181853A1 EP2181853A1 (en) 2010-05-05
EP2181853A4 EP2181853A4 (en) 2012-02-29
EP2181853B1 true EP2181853B1 (en) 2015-09-23

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US (1) US8492308B2 (ko)
EP (1) EP2181853B1 (ko)
JP (1) JP4942224B2 (ko)
KR (1) KR101504991B1 (ko)
CN (1) CN101835623B (ko)
WO (1) WO2009025316A1 (ko)

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WO2009025316A1 (ja) 2009-02-26
CN101835623B (zh) 2013-04-03
KR101504991B1 (ko) 2015-03-23
CN101835623A (zh) 2010-09-15
JP4942224B2 (ja) 2012-05-30
US8492308B2 (en) 2013-07-23
EP2181853A4 (en) 2012-02-29

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